3 preafnp, Typ 1: dsl, 2, 3 (distortion 1,2,3), Typ 4,5: odl & od2 (overdrive 1 & 2) – Yamaha FX770 User Manual
Page 194: Typ 6: crn (crunch), Typ 7: cln (clean), 1) tone control: typl undtyp2, 2) tone control: user, 3 preamp
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